Coil and core arrangement



July. 6, 1948. H. E. SOMES 2,444,475

COIL AND CORE ARRANGEMENT Filed Oct. 7, 1944 2 Sheets-Sheet v INVENTOR. fiowardfi'. 5077295 /7 T TORNEY July 6, 1948. H. E. SOMES 2,444,475

I COIL AND CORE ARRANGEMENT Filed Oct. 7, 1944 2 Sheets-Sheet 2 H7 TORNE Y Patented July 6, 1948 COIL AND CORE ARRANGEMENT Howard E. Somes, Detroit, Mich, assignor, by

I mesne assignments,

Company, Cleveland,

Ohio

The Ohio Crankshaft hio, a corporation of Application October 7, 1944, Serial No. 557,607

6 Claims.

This invention relates to electrical apparatus, particularly to coils and the like associated with a core of transformer iron.

-In many instances of coils used in transformers and electromagnetic inducing heads, a core of transformer iron is concentrically associated with the coil andthe coil ends are turned to extend through the core. In such cases, there is a tendency due tothe changein direction of the flux path incident to the coil end turn-out, for the 1 portions of the core adjacent the turned-out coil ends to become highly heated to an undesirable degree.

The primary object of the present invention is to provide in a coil and'core arrangement having the coil ends extending through the core, improved means for shielding the portions Ofthe core through which the'coil endsextend from the detrimental heating effect of the coil.

Another object is to provide improved means for reducing the reactance in those portions of a coil core which lie adjacent the turned-cut ends of the coil. v

A further object is to provide-an annular coil core of laminated material with a portion thereof in the form of a block of non-magnetic and high electrical conductivity through which the coil ends extend.

With the above andother objects in view which will be apparent from the following description tothose skilled in the art to which the invention appertains, the present invention consists in certain features of construction and combinations of parts to be hereinafter described with reference to the accompanying drawings, and then claimed.

In the drawingswhichillustratea suitable embodiment of the invention:

Figure 1 is a vertical section through a transformer arrangement having the present-invention incorporated therein;

Figure 2' is a transverse section taken substantiallyon v line 22 of Figural;

Figure 3 is anenlarged elevation of theshieldingdevice; and

Figure 4 is a fragmentary view'taken substantially on line 44 of Figure 1.

Referring to the accompanying drawings in which like numerals refer to like parts throughout the several views, the invention is shown for the purpose of illustration as applied to a secondary winding or coil of a switching type transformer. It is to be understood however that the invention is applicable to any coil and core arrangement, whether the coil is of the type to induce currents or have currents induced there- 1n.

The secondary winding or coil 1 shown in. the drawings is of the m-ulti-turn type and is carried within a recess 2 formed in the inner face of an annulus 3 comprised of a plurality of tap'er ground laminatio-ns of magnetic material. The coil turns are separated from each other 'and'from the walls of the recess 2 by suitable electric insulation 4.

The core or annulus 3- is encased within an annular casing 5 having an end flan'geiiagainst which one end of the annulus 3 abuts and an annular ring I secured to' its opposite end by screws 8, which ring abuts the other end of the annulus 3 in clamping relation.

The casing 5 is provided at one side with an opening 9.

In accordance with the present'invention, the annular continuity of the core 3 is interrupted by a wedge block I'll extending the full axial extent thereof. The wedge block I0 is provided with spaced upper and lower openings l l and I2, respectively which are aligned with the opening 9 of the casing 5.

The coil ends l3 and M are turned outwardly through the openings 1 l and l 2", respectively, and are provided with terminal connectors l5 and it, respectively, to extend through the casing opening 9. The body of the coil l and the ends I 3 and I 4 thereof are insulated from the block it! by the insulation 4.

Secured to the casing 5"over the opening 9 by screws I1 is a terminal unit which, although forming no part of the present invention, comprises concentric terminal posts wand 19 having. laterally extending arms 20 and 2|, respectively; each terminal post and its and being electrically insulated from the other post and its arm by insulation 22 which also insul-ates the terminal unit from the casing 5. The arms 20 and 21 are'provided with openings through which the terminal connectors I5 and [6, respectively, extend; the

connectors l5 and I6 being secured'to these arms by nuts 23 threaded thereon. The terminal posts is and I9 provide means for the attachment of suitable bus bars, cables, conductors and the like (not shown).

Secured to the casing 5' is "an upper casing 2'4".

Secured to the lower end of the casing 5 is a casing 25 which in the uncoupled position shown in Figure 1 houses the transformer primary coil 25 which forms no part of the present invention. The primary coil 26, although no actuating means is shown in the drawings, is movable upwardly into coupled relation with the secondary coil I, and in its coupled position is energized through the axially arranged concentric conductors 21 and 28 (Figure 2), the primary element support 29 being provided. with annular resilient connectors 30 and 3| to effect connection with the conductors 21 and 28 respectively.

The wedge block I0 is constructed of a metal of non-magnetic high electrical and high heat conductivity as compared with iron such as for example, copper, aluminum and the like, and is provided with a U-shaped cooling passage 32, the ends of which open through the upper end of the block Ill. Suitable conduits 33 and 3'4 are connected with the ends of the passage 32 and are provided with connectors 35 extending through the upper casing 24 for connection with suitable coolant supply and discharge conduits (not shown). A means is thus provided for circulating a cooling fluid through the wedge block ID to maintain the same at a desired low temperature.

The wedge block is of high electrical condue tivity reduces the reactance of the portions of the magnetic annulus 3 adjacent the turned-out coil ends l3 and. I4 incident to the magnetic laminations and through its high conductivity in combination with the cooling passage 32 prevents excessive heating of the end laininations incident to the turned-out coil ends which in the absence of the wedge block I!) would otherwise occur.

The Wedge block ill thus provides an eificient means for shielding the laminations from List-- rimental heating effects incident to the coil.

While the invention has been described in connection with a coil having a surrounding core of magnetic material, it will be obvious to those skilled in the art that it is equally as applicable to a coil having, an internal core.

It will also be obvious to those skilled in the art that various changes may be made in the detailed construction and arragnements of the the parts described without departing from the spirit and substance of the invention, the scope of which is defined by the appended claims.

What is claimed is:

1. In a device of the character described an iron core of annular formation having circumferentially spaced ends and a helical conductor concentrically disposed adjacent and insulated from said core, said conductor having radially extending ends disposed in the space between said spaced ends, and a metallic, non-magnetic member disposed in said space in engagement with said, core ends, said conductor ends extend ing through and being insulated from said member,

.2. In a device of the character described an iron core of annular formation having circumferentially spaced ends and a helical conductor concentrically disposed adjacent and insulated from said core, said conductor having radially extending ends disposed in the space between said ends, a metallic, non-magnetic member disposed in said space in engagement with said core ends, said conductor ends extending through said memher and means for insulating said member, said member having passage means therein for the circulation of cooling fluid.

3. In a helical electrical conductor arrangement having substantially axially aligned, radially extending ends, an iron core of annular formation extending from a radial plane relatively closely spaced from one side of said ends concentrically adjacent to said conductor to a radial plane relatively closely spaced from the other side of said ends, a member of high heat conductivity, as compared to said core, disposed in the space between the ends of said core, said conductor ends extending through said member, and means insulating said conductor from said core and said memberi 4. In a device of the character described, an annulus comprised of a rectangular block of nonmagnetic metal and a. plurality of abutting laminations of magnetic iron, the endmost laminations abutting opposite sides of said block, means for holding said laminations and block in annular formation, a helical conductor concentrically disposed adjacent and insulated from one circumferential side of said annulus, said conductor having radially extending end terminals extending through said block, and means for insulating said conductor from said block and laminations.

5. In a device of the character described, an annulus comprised of a rectangular block of nonmagnetic metal of high electrical and heat conductivity, as compared with iron, and a plurality of abutting laminations of magnetic iron, the endmcst laminations a. utting opposite sides of said block, means for holding said laminations and block in annular formation, and a helical conductor concentrically disposed adjacent and insulated. from one circumferential side of said annulus, said conductor havin radially extendiilg end terminals extending through and insulated from said block.

6. In a device of the character described, an annulus comprised of a rectangular block of metal of high electrical and heat conductivity, as compared with iron, and a plurality of abutting laminations of magnetic iron, the endmost laminations abutting opposite sides of said block, means for holding said laminations and block in annular formation, and a helical conductor concentrically disposed adjacent and insulated from one circumferential side of said annulus, said conductor having radially extending end terminals extending through and insulated from said block, said block having passage means therein closely adjacent the said side thereof for the circulation of cooling fluid.

HOWARD E. SOMES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,186,626 Dake Jan. 9, 1940 2,223,902 Sornes Dec. 3, 19% 2,283,940 Morris May 26, 1942 

